Injection-syringe



N. KITAOKA.

INJECTION SYRINGE.

APPLICATION FILED FEB. 11, 1920.

Patented Dec. 21, 1920.

Z g [N VENTOR B Y A? I A TTORNE Y UNITED STATES PATENT OFFICE.

NOBUGHIKA KITAOKA, OF TOT'I'ORI-KEN, JAPAN, ASSIGNOR TO SHIGEZONISHITANI,

OF TOKYO, JAPAN.

Specification of Letters Patent.

INJECTION-SYRINGE.

Patented Dec. 21, 1920.

Application filed February 11, 1920. Serial No. 357,924.

To all 20 ham it may concern Be it known that I, NOBUGHIKA KITAOKA, asubject of the Emperor of Japan, and a resident of No. 59 Katashiba,Santoku- Mura, Tohaku-Gun, Tottori-Ken, Empire of Japan, have inventednew and useful Improvements in Injection-Syringes, of which thefollowing is a specification.

This invention relates to improvements in injection syringes and relatesmore particularly to the syringe adapted for introducjgioili ofmedicated solution into the human oc v.

The primary object of the invention is the provision of a syringe ofthis character which shall be provided with means for eliminating anysuch foreign matter as will be likely found mixed with the fluid beforethe same is ejected through the nozzle, so as to guard againstsuppuration or any other detrimental effect, in such a manner as toenable the medicated solution injected to be received by the patient inan absolutely pure condition but giving no opportunity to have thequalities of the solution impaired.

A still further object of the invention is the provision of a syringewhich shall be simple, durable and eiiicient, and which may bemanufactured and sold at a comparatively low cost.

lVith the above and other objects in View, the invention consists in thenovel construction, combination, and arrangement of parts hereinafterfully described and claimed, and illustrated in the accompanyingdrawing, wherein Figure J. is a sectional view taken on a planeextending centrally and longitudinally through the syringe constructedin accordance with my invention.

Fig. 2 is a plan of the bearing ring.

Fig. 3 is a plan of the perforated disk.

Fi 4c is a cross sectional view taken on line i B of Fig. 1.

Referring to the drawing by reference numerals, l0 designates thecylinder of my improved syringe into which fits a hollow piston 1,having at its upper end a hinged cover 13 adapted to be flung open so asto admit therethrough the necessary medicated solution into the bore ofthe piston 1.

The lower threaded end of the piston is, as shown, engaged by a suitablebearing ring 2, directly adjacent of Which there are arranged insuccessive order and in close contact with each other, a filter cloth 8,preferably of silk, perforated disk 4:, and a disk valve 5,respectively, all being held in position by means of a perforated socket6 which engages the threaded end of the cylinder 1.

The lower end of the cylinder 10 is threadedly engaged by a socket 11,which, in turn, is threadedly engaged by a nut 12, thereby holding theusual needle-shaped nozzle 9 in position centrally of the syringe. 7 isa spring bearing upon a ball valve 8 which is placed within the spacebetween the lower portion of the socket 11 and the upper end portion ofthe nozzle 9, so that when the piston is drawn up the ball valve 9 isforced to close the lower opening of the socket 11, thereby creating inthe space between the piston and cylinder the vacuum for causing thecontained fluid to be filtered through the filter cloth 3, and bypushing the piston back the disk valve 5 is closed and the ball valve 8depressed to allow the contained fluid to pass out through the nozzle.

By this construction I am enabled to provide a syringe which is entirelysafe and eiiicient, and may be admirably well employed for injectingfluid of such a nature as will decompose in a very short interval oftime. The syringe made in accordance with my present invention istherefore sought by surgeons and others for not only the intra venousinjection but also for intramuscular. intraspinal and subcutaneousinjection.

What I claim, and desire to secure by Letters Patent is An injectionsyringe comprising a hollow piston, a bearing ring, filter cloth,perforated disk and a valve, respectively, closely arranged and insuccessive relation to each other, all being held in position by meansof a nut engaging the end portion of the piston, a second socket, aneedle shaped nozzle, 2 second nut securing both the second socket andneedle shaped nozzle in position, and a spring bearing ball valveoccupying the space between the said second socket and nozzle,substantially as set forth.

In testimony whereof I afiix my signature in presence of two witnesses.

NOBUCHIKA KITAOKA.

Witnesses:

Toco OKnBo, H YA U AB

